黄土丘陵区天然杜松种群结构及动态分析

doi:10.13866/j.azr.2023.08.11

Abstract

Abstract:

This study focused on the natural Juniperus rigida population in the loess hilly region of Inner Mongolia. The structure and dynamic changes of the population were analyzed using a static life table, survival function, dynamic quantitative analysis, and time series model. The results showed that the population mainly comprised many individual seedlings, followed by medium and less mature trees. Combined with the dynamic change index V_pi > 0, the population was a growth type. The survival curve was verified using the curve model and tended to Deevey-II, indicating that the mortality rate of each age class was stable. Considering the external interference, the dynamic index tended to 0, and the population growth is not obvious under the interference condition. In the survival function analysis, the population showed a strong survival trend in the early stage, followed by a gradual decline in the middle stage. During the 2-to-8-year period, the number of seedlings decreased while middle-aged and adult trees increased. The seedling stage is crucial to the regeneration and development of the population. Therefore, implementing scientific protection measures for seedlings to promote population regeneration is recommended. Research on the internal mechanisms of the Juniperus rigida population can enrich vegetation construction in arid areas, provide a reference for population management, and provide a theoretical basis for vegetation protection and restoration in the loess hilly area.

Key words: loess hilly region, Juniperus rigida, population structure, survival analysis, dynamic analysis

SONG Jiajia, LI Gangtie, GUO Jingjie, GU Zhonghou, LIU Kun, LI Zhilong, KANG Xia. Population structure and dynamic analysis of natural Juniperus rigida in a loess hilly area[J].Arid Zone Research, 2023, 40(8): 1304-1311.

Figures/Tables 7

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References 38

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x	A_x	a_x	l_x	lnl_x	d_x	q_x	L_x	T_x	e_x	K_x	S_x
Ⅰ	30	47	1 000	6.91	234.04	0.23	883	8058	3.16	0.27	0.77
Ⅱ	36	36	766	6.64	191.49	0.25	670	7175	2.97	0.29	0.75
Ⅲ	41	27	574	6.35	148.94	0.26	500	6504	2.80	0.30	0.74
Ⅳ	19	20	426	6.05	106.38	0.25	372	6004	2.60	0.29	0.75
Ⅴ	25	15	319	5.77	85.11	0.27	277	5632	2.30	0.31	0.73
Ⅵ	11	11	234	5.46	42.55	0.18	213	5355	1.96	0.20	0.82
Ⅶ	8	9	191	5.25	42.55	0.22	170	5143	1.28	0.25	0.78
Ⅷ	5	7	149	5.00	-	-	74	4972	0.50	-	-

Population structure and dynamic analysis of natural Juniperus rigida in a loess hilly area

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径级	原始数据	M₂⁽¹⁾	M₃⁽¹⁾	M₄⁽¹⁾	M₅⁽¹⁾	M₆⁽¹⁾	M₇⁽¹⁾	M₈⁽¹⁾
Ⅰ	30
Ⅱ	36	33
Ⅲ	41	39	36
Ⅳ	19	30	32	32
Ⅴ	25	22	29	31	31
Ⅵ	11	18	19	24	27	27
Ⅶ	8	10	15	16	21	24	24
Ⅷ	5	7	8	13	14	19	21	22

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径级	原始数据	M₂⁽¹⁾	M₃⁽¹⁾	M₄⁽¹⁾	M₅⁽¹⁾	M₆⁽¹⁾	M₇⁽¹⁾	M₈⁽¹⁾
Ⅰ	30
Ⅱ	36	33
Ⅲ	41	39	36
Ⅳ	19	30	32	32
Ⅴ	25	22	29	31	31
Ⅵ	11	18	19	24	27	27
Ⅶ	8	10	15	16	21	24	24
Ⅷ	5	7	8	13	14	19	21	22

径级	原始数据	M₂⁽¹⁾	M₃⁽¹⁾	M₄⁽¹⁾	M₅⁽¹⁾	M₆⁽¹⁾	M₇⁽¹⁾	M₈⁽¹⁾
Ⅰ	30
Ⅱ	36	33
Ⅲ	41	39	36
Ⅳ	19	30	32	32
Ⅴ	25	22	29	31	31
Ⅵ	11	18	19	24	27	27
Ⅶ	8	10	15	16	21	24	24
Ⅷ	5	7	8	13	14	19	21	22